[vtkusers] How to create 3d surface from vtkPolyData?

[Lars Friedrich Lars]

yes, the filter requires the contours being stored as polys.
lars

-------- Original-Nachricht --------
> Datum: Sun, 6 Feb 2011 13:33:18 +0300
> Von: Andrej Gluhov <realandron at gmail.com>
> An: Lars Friedrich Lars <lars-friedrich at gmx.net>, vtkusers <vtkusers at vtk.org>
> Betreff: Re: [vtkusers] How to create 3d surface from vtkPolyData?

> Thanks, I converted to ijk coordinates. Now one more question:
> 
> "The contours are input as
> vtkPolyData<http://www.vtk.org/doc/nightly/html/classvtkPolyData.html>,
> with the contours being polys in the
> vtkPolyData<http://www.vtk.org/doc/nightly/html/classvtkPolyData.html>
> ."
> 
> If my vtkPolyData is lines, most I convert lines to polys?
> 
> 2011/2/4 Lars Friedrich Lars <lars-friedrich at gmx.net>
> 
> > Andrej,
> >
> > it's possibly right that all input points are double-casted integers.
> > However, the example nicely shows how to overcome the primary limitation
> of
> > vtkVoxelContoursToSurfaceFilter by adapting the underlying voxel-spacing
> and
> > converting to ijk-coordinates first, and then back-transforming the
> output
> > mesh to world coordinates again.
> >
> > Have a closer look on the code blocks statring with these comments:
> >
> > // Convert to ijk coordinates for the contour to surface filter
> >
> > and
> >
> > // Rescale the output back into world coordinates and center it
> >
> > .
> >
> > HTH,
> > lars
> >
> > -------- Original-Nachricht --------
> > > Datum: Fri, 4 Feb 2011 16:50:42 +0300
> > > Von: Andrej Gluhov <realandron at gmail.com>
> > > An: David Doria <daviddoria at gmail.com>, vtkusers <vtkusers at vtk.org>
> > > Betreff: Re: [vtkusers] How to create 3d surface from vtkPolyData?
> >
> > > Yes, I looked. In this example all points are integer values in double
> > > format. My contours have points with double value...
> > >
> > > vtkVoxelContoursToSurface description:
> > >
> > > create surface from contours
> > >
> > > vtkVoxelContoursToSurfaceFilter<
> >
> http://www.vtk.org/doc/nightly/html/classvtkVoxelContoursToSurfaceFilter.html
> > >is
> > > a filter that takes contours and produces surfaces. There are some
> > > restrictions for the contours:
> > >
> > >    - The contours are input as
> > >
> vtkPolyData<http://www.vtk.org/doc/nightly/html/classvtkPolyData.html>,
> > >    with the contours being polys in the
> > > vtkPolyData<http://www.vtk.org/doc/nightly/html/classvtkPolyData.html>
> > >    .
> > >    - The contours lie on XY planes - each contour has a constant Z
> > >    - The contours are ordered in the polys of the
> > > vtkPolyData<http://www.vtk.org/doc/nightly/html/classvtkPolyData.html
> > >such
> > > that all contours on the first (lowest) XY plane are first, then
> > >    continuing in order of increasing Z value.
> > >    - *The X, Y and Z coordinates are all integer values.*
> > >    - The desired sampling of the contour data is 1x1x1 - Aspect can be
> > > used
> > >    to control the aspect ratio in the output polygonal dataset.
> > >
> > >
> > >
> > > 2011/2/4 David Doria <daviddoria at gmail.com>
> > >
> > > > 2011/2/4 Andrej Gluhov <realandron at gmail.com>:
> > > > > Hello.
> > > > >
> > > > > I have series of contours in vtkAppendPolyData. How to create
> > surface?
> > > > > vtkVoxelContoursToSurface needs integer points!
> > > >
> > > > What do you mean it needs integer points? Have you looked at this
> > > > example
> > > > http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/ContoursToSurface
> > > > ?
> > > >
> > > > David
> > > >
> > >
> > >
> > >
> > > --
> > > С Уважением,
> > > Андрей.
> > > Best regards, Andrew
> >
> > --
> > GMX DSL Doppel-Flat ab 19,99 Euro/mtl.! Jetzt mit
> > gratis Handy-Flat! http://portal.gmx.net/de/go/dsl
> >
> 
> 
> 
> -- 
> С Уважением,
> Андрей.
> Best regards, Andrew

-- 
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